Add element at the end of linked list

Question

How can i add an element at the end of a linked list?

This is my try but I know there are some incorrect things:

typedef struct node_struct{
        int data;
        struct node_struct *next;
}node;

node *end(node *p){
     node *new = malloc(sizeof(node));
     node *next;
     int value;
     printf("Insert new element: ");
     scanf("%d",&value);
     p->next = next;
     new->data = value;
     next = new->data;

     return next;

     return next;
}

Now this is my code but it's still doesn't work:

node *end(node *p){
     node *new = malloc(sizeof(node));
     node *next;
     int value;
     printf("Insert new element: ");
     scanf("%d",&value);
     p->next = next;
     new->data = value;
    while(next->next){
         next = next->next;
    }
    next->next = new;

    return new;
}

Answer 1

Problem solved, this code works well, at least I think so.

void end(node *head){
     node *new = malloc(sizeof(node));
     node *next;
     int value;
     next = head->next;
     printf("Insert number to add at the end: ");
     scanf("%d",&value);
     new->data= value;
     while(next->next){
          next = next->next;
          }
     next->next = new;
     }